Ciandre Moseley testified during the second day of Simpson's murder trial. Simpson, 25, is accused of murder and drug charges; police say he shot Keise at their Falls View Drive apartment in Manchester on July 21, 2012.

Moseley testified that Keise wasn't happy and there were signs she was going to move out. Simpson was upset because he found pictures of Keise with another man while on a recent trip to Jamaica, she said.

Keise planned to return to Jamaica in September, Moseley testified.

Also Friday, Jill Therriault, a forensic science examiner, testified about the suspected murder weapon, a Glock found on the bed in the apartment after the shooting. She said the shooter would have to pull the trigger hard to fire such a gun. Prosecutor Anne Mahoney was trying to dispel Simpson's claim that the gun fired accidentally when Keise pushed it away as he held it in front of her.

"The amount of pressure it takes is almost as heavy as a gallon of milk," Therriault said.

Later, Det. James Graham used a fake gun and what court staff referred to as a "forensic dummy" to demonstrate Simpson's version of how the shooting happened. Simpson said Keise was in bed, half-lying down, half-sitting up, and he leaned his folded arms on the side of the bed, Graham testified.

He took his gun out of his waistband because it felt uncomfortable, he told the detective, and "she pushed it away from him," Graham testified.

Graham also testified that if the shooting played out the way Simpson said it did, the gun should have fired into the headboard, not into Keise.